US2078365A - Means and method for making strip - Google Patents

Description

April 1937- F. c. BIGGERT, JR.. Er AL 2,073,365

MEANS AND METHOD FOR MAKING STRIP Filed Aug. 6, 1935 4 Sheets-Sheet 1 ATTORNEYS INVENTORS' Br I AH April 27, 1937.

F. C. BIGGERT, JR. ET AL MEANS AND METHOD FOR MAKING STRIP Filed Aug. 6, 1955 4 Sheets-Sheet 2 April 27, 1937; F. c. BIGGERT, JR." ET AL MEANS AND METHOD FOR MAKING STRIP INVENTORS WITNESSES ATTORNEYS April 27, 193 F. c. BIGGERT, JR. ET AL MEANS AND METHOD FOR MAKING STRIP Filed Aug. 6, 1955 4 Sheets-Sheet 4 Patented Apr. 27, 1937 UNITED STATES PATENT OFFICE MEANS AND METHOD FOR MAKING STRIP Application August 6, 1935, Serial No. 34,912

21 Claims.

This invention relates to the manufacture of metal strip, and more particularly is concerned with'improved processes and apparatus for welding strip end to end to form a continuous length.

Coryell Patent No. 1,940,939 broadly discloses and claims the method of welding metal strip end to end with associated cold-rolling operations. Making the strip continuous eliminates roll marks caused by the fish-tail ends of an ordinary short strip passing through the mills, increases production and improves the general efiiciency of the strip mills. The present invention comprises an improvement upon the Coryell method, and more particularly provides apparatus for commercially welding strip end to end.

Heretofore, in joining relatively long metal strip portions together, difficulty has been experienced in properly aligning the strip portions with each other during the shearing of the crop ends and the welding of the strips together. Another source of trouble has been that the crop ends were not cut in the same manner from the strip portions so that the abutting edges of the strip portions prior to being welded were apt to 5 be dissimilar across their width. Again difficulty has arisen due to the fact that the strip must ordinarily be clamped after aligning with the shear for the shearing operation, and the strip must again be clamped for the welding operation. This has necessitated considerable time by prior known methods and machines, and positive alignment of the strip portions and an effective weld have not readily been accomplished.

It is an object of the present invention to avoid and overcome the foregoing and other diificulties attending the manufacture of continuous metal strip by the provision of improved means and methods for rapidly and effectively welding together metal strip portions in a commercially practical manner.

Another object of the invention is to provide apparatus for welding together metal strip to form a continuous strip with the apparatus aligning and clamping the strip prior to a subsequent shearing of the crop ends and a final welding of the strip together, with the apparatus operating without releasing the clamps between the shearing and welding steps. Another object of the invention is to provide a method of welding together metal strip in end-to-,

end relation with the strip being positively aligned and effectively welded while requiring a minimum of time and labor.

The foregoing and other objects of the invention are achieved by the practice of our method wherein the ends of two strips are aligned with each other with the strip being clamped in the aligned position. The crop ends of the strips are cut off with identical cuts so that the ends of the main portions of the strips are in relation for welding. The strip ends are then welded with a butt joint to form a continuous strip and then for the first time the strip is unclamped and is passed to the rolling mill or, preferably, is coiled prior to further operations thereon.

Apparatus embodying the features of the invention includes means for aligning with each other or with the same element the strip portions to be welded together with associated means for clamping the strip portions in aligned position. A single shear is employed for severing the crop ends of both strip portions so that the cuts thereon are identical, and welding means are so associated with'the apparatus that the strip ends can be welded together without releasing the clamping means. The clamps holding the strip ends prior to and during welding may be made adjustable toward and from each other so that the exact distance between the ends of the strip portions can be adjusted to best adapt the abutting faces for the desired welding operation. Strip-coiling means are likewise provided on the apparatus for coiling the strip after welding. The apparatus can also be used to weld a plurality of additional strips onto the continuous strip and this is an important advantage of the apparatus herein disclosed and claimed.

Referring to the drawings wherein several embodiment of the invention are illustrated, Fig. 1 is a plan view of one form of the invention; Fig. 2 is a vertical longitudinal cross-sectional view taken on line 11-11 of Fig. 1; Fig. 3 is a transverse vertical sectional view taken on line III-III of Fig. 1 and illustrating the details of the shear and welding means associated with the apparatus; Fig. 4 is a vertical sectional view taken on line IV-IV of Fig. 3 and showing the construction of the welding mechanism; and. Fig. 5 is a vertical longitudinal cross-sectional view similar to Fig. 2, but of a modification of the invention.

While the invention contemplates welding strips end to end regardless of the particular way the strip is handled before and after the welding operation as, for example, ,by prior or subsequent rolling operations, the strip is preferably coiled in accordance with the usual practice to facilitate its handling and accordingly the invention is illus rated as being adapted to handle coiled strip.

In the drawings, particularly Figs. 1 to 4. the apparatus is illustrated as comprising a strip uncoiler 3 flattening rolls 3, clamps I, aligningv rollers a shear l3, .a welder ll, clamps l3, aligning rollers H, a pinch roll stand II and a strip coiler l3, all carried upon suitable foundations indicated generally at 23.

The shear l3 and welder II are laterally connected end to end, as best seen in Figs. 1 to 3, and are slidably supported upon I-beams 23 carried by the foundation 23. I Means are provided for controlling the lateral position of the shear and welder, and in the particular embodiment of the invention illustrated these comprise racks 24 secured to the bottom of the shear l3 with pinions 23 engaging with the racks and carried upon a shaft 23 connected to a suitable motor 23 through a gear box 23.

'Ihe shear I3 is of any known type, but preferably is of the bottom blade actuated type, as shown in Figs.- 2 and 3, wherein an upper blade 3| is carried by a C-frame 32 with a bottom blade 33 being carried by a shaft 33. The shaft 33 mounts eccentrics 33 which are received in suitable bearings in the blade support. The shaft 33 is operated by a motor 31 through a gear box '33.

The support for the lower shear blade 33 is formed with inclined side portions 33' which permit the sheared crop ends of the strips to slide down from the blade to gutters 33 and from there to suitable receptacles in accordance with known practice.

The welding mechanism ll associated with the shear l3, as best seen in Figs. 3 and 4, includes a vertically flxed platform 3| having an opening therein .through which projects a bar electrode 32 which is adapted to be moved to a retracted vertical position from its normal welding position. To this end the bar 32 is carried by a toggle linkage 33 connected at its ends to] brackets 33 and 33 secured, respectively, upon the base of the welder and to the block. The position of the toggle linkage 43 is controlled by an air cylinder 31 so that the block can be moved to a lower or retracted vertical position or to the welding position as shown in the drawings. This permits the ready movement of the welder to and from position about the aligned strips as hereafter more fully explained.

The particular means for welding the strip ends together as well as the exact typeof welding employed can be widely varied. However, in the form of the invention illustrated, these means include clamps 53 adapted to clamp on the end of the strips to be welded with a plurality of arc welding electrodes 5| being provided at laterally spaced portions on the welder with means, shown generally at 32-, for moving the electrodes along, the seam to be welded whereby a proper weld is eflected.

Associated with the shear and welding unit are ,means for delivering the strip in aligned relation to the shear, and .these means comprise the uncoiler 5 of any known type which functions to receive the coiled strip S. In the particular form of the invention illustrated this reel includes supporting rollers 55 driven by shafts 33 secured through a gear box 51 to a motor 33. Saddle 33a may be provided to further assist in centering and supporting the coil of strip S.

From the uncoiler 5 thestrip S passes to the flattening rolls, shown generally at 3, which for example may comprise three rolls 33, 33 and 3| journalled in a frame 32 with adjustable amass means 33 being employed to determine the position of the roll 33 whereby the particular dat tening action can be controlled. The rolls 33 and "are preferably driven as by shafts 33 through the gear box 31 and motor 33.

From the flattening rolls 3 the strip 8 passes between the aligning rolls 3 which are rotatable about vertical axes and which are carried in blocks 33 threaded on the ends of opposite handscrews 31. The opposite handscrews 31 can be adjusted by hand-wheels 33, or power means can be employed if desired to eflect this adjustment. In this manner the lateral spacing between the aligning rollers 3 can be adjusted to adapt the apparatus to align strip of any width with the shear and with each other.

The'clamping mechanism indicated generally by the numeral 1 includes a bed-plate 13 carried by the same frame 32 as supports the flattening rolls 6. Positioned above the clamping bed 13 is a transversely extending jaw II whose vertical position is controlled by air motors 12 secured to 'a spanner beam I3 mounted on end plates I3 supported by the clamping beds 13. Various clamping means can, of' course, be employed since the particular purpose of the clamps is merely to prevent the strip from getting out of alignment. Thus the clamps may bein the nature of air motors which engage with the aligning rollers ll of similar construction to those heretofore described are employed which align the strip S with the shear and welder. The clamping mechanism I3 is similar to the clamping mechanism 1 with the exception that the mechanism I3 is adapted to have relatively small adjustment towards and from the shear and welder l3 and II. This is achieved in the embodiment of the invention illustrated by providing the clamping mechanism with bearing blocks 'Il which surround eccentrics 13 carried by a shaft 19. The shaft may be rotated by a hand-wheel 33 through worm-gear mechanism 3| to provide for slight adjustment of the clamping means l3 towards and from the shear and welder. tant, as hereafter described, in order to provide the desired clearance between the ends of the strip to be welded.

The pinch roll stand I1 is adapted to move the extending through a gear box 35 to a motor 33.

The coiler l3 for receiving the welded-together lengths of strip can be of any known or preferred design, but in the embodiment of the invention illustrated includes a collapsible drum 33 driven by a motor 33 through a gear box 3|. A'bottom cradle 33 may be provided below the reel l3 to receive the coiled strip in accordance with standard practice.

In the operation of the apparatus just described, assuming the coils of strip 8 and S are to be joined together, the strip S is fed through the entire mechanism until the tail-end of the strip extends back through the shear the desired distance so that the crop end will be severed from the main portion of the strip when the shear is operated. Prior to the shearing operation the vertical rollers i3 forming the aligning means are moved inwardly by the operation of the hand- This adjustment is sometimes imporshear l3. When the strip is in the desired alignment, clamping means I3 is operated to clamp the strip securely in the desired position. The shear is now operated to sever the crop end from the strip S and the crop end falls into the gutter and is removed. It will be seen from Fig. 2 that in the shearing operation the end of the main portion of the strip S is pushed up against the upper blade 3| of the shear so that it is held in wedged relation against the blade. In this position the strip S is out of the way and permits a shearing cf the crop end of the strip S as hereafter described. If, for any reason, the strip S will not stay in the wedged position illustrated in the drawings, a magnet 95 may be associated with the upper shear blade for this purpose.

The end of the strip S is now fed in through the flattening rolls 6, the clamp land the shear I0 so that its crop end extends through the shear the desired distance. The aligning rollers 8 are operated by the hand-wheels, 68 to bring the strip S into alignment with the shear I0 and thus with the strip S. Clamp lis now energized to secure the strip S in position and the shear is operated to cut the crop end of the strip S on exactly the same cut as the one made on the strip S. The crop end, of course, falls into the gutter 40 and is removed. The sheared ends of the strips S and S are now in substantially end to end contact and are ready for welding.

The entire shear I0 and welder II are now movedlaterally through agency of the racks 24, pinions 25 and motor 28 to carry the shear I0 out of the way and to bring the welder II over the butt joint between the strips. In moving the welder II over the ends of the strips to be welded the bar 42 of the welder should be at its lower position which thereby permits the lateral retraction of the shear and the positioning of the welder as desired without interference with the strip ends. Once thewelder is over the strips the air cylinder 41 is operated to move the bar 42 to its uppermost or welding position.

If desired, the particular distance between the butt faces of the strip edges to be welded can be adjusted by operation of the hand-wheel 80 which moves the clamping means I3 and the strip S towards or from the welder II.

The clamps of the welding head are now brought into position to bear on either side of the seam to be welded and the welding apparatus is started to effect a true even weld of the aligned strips which is facilitated by the identical cuts on the strip edges and the adjustable spacing therebetween.

Once the weld has been made the reel I9 is driven by the motor 90 to coil the continuous strip material until the crop end of the strip S reaches the shear I0 as did the crop end of the strip S. Another coil of strip is then put on the uncoiler 5 and the operation is repeated as heretofore explained. In this manner any number of lengths of strip can be rapidly welded together end to end in excellent alignment.

Although not preferred, the invention contemplates simultaneously shearing both crop ends of the strip, in which case the identical cuts are not made subsequent to each other as above set forth, but are made simultaneously with both crop ends extending through the shear at the same time. The remainder of the welding operation is as described above.

The basic features of the modification of the invention illustrated in Fig. 5 are similar to those above described in conjunction with the form of the invention shown in Figs. 1 to 4 with the exception that inFig. 5 the shear and the welder are placed in longitudinal alignment rather than in lateral alignment. More particularly, in Fig. 5 the numeral I0l indicates a reel uncoiler of known character adapted to support strip S for passage through a flattening roll stand shown generally at I02. Associated with the roll stand I02 is a bed I03 formed of bars extending to a shear I04 and a welder I05. Clamping mechanisms I01 and I08 are provided at opposite longitudinal sides of the shear I04 and welder I05. A roll stand i0!) is spaced between the clamp I08 and a coiler M0 for strip S, and a bed III! formed of bars extends between the roll stand I09 and the welder I05.

The construction of the clamping means I01 and I08 of this embodiment of the invention is quite distinct from that shown in Figures 1 to 4 and described above. More particularly, these means include a carriage I I3 supported by wheels H4 upon rails H5. The carriage H3 is adapted and Ill between the clamps and the shear and welder. The upper surfaces of the bars of the beds I03 and III are below the clamping surfaces proper so as not to interfere with the clamp ng of the strips. Alignment means I20 of substantially the same character as employed in the form of the invention illustrated in Figures 1 and 4 are also provided to properly align the strips S and S with each other.

The operation of the embodiment of the invention shown in Fig. 5 is quite similar to that described in detail above in conjunction with the mechanism of Figs. 1 to 4. The essential difference is that in the apparatus of Fig. 5 after the shearing of the crop ends of the strips, either in turn or simultaneously. the clamp frame I I3 is-moved from the dotted to the full-line position shown by operation of the pinion I I1 against the rack IIB to bring the aligned clamped ends over the welding unit. The strips S and S are now welded end to. end and the clamps released and returned to the dotted-line position. The strip is then coiled at H0 and other strips may then be added to the continuous strip as will be understood.

In moving the clamps I01 and I08 and their for welding strip end to end in properly aligned relation with the abutting faces of the weld identical. The strips are clamped in alignment before shearing with the clamps only being re- '"leased after welding whereby a rapid yet effective weld of aligned strip is obtained. The mechanism and its associated processes adapt themselves to the commercial efficient manufacture of cold metal strip and require a minimum number of operators. Upon subsequent rolling of the continuous strip roll markings due to the fish- 'tail or crop ends of the strip are substantially eliminated and the Speed and efiiciency oil-cold strip mills is greatly improved.

The expressions crop", 'crop end and crop ends as employed in the specification and claims, are intended to cover any end portion cut from the strip to prepare the strip end i'or welding. 5

The word continuous" as employed in the specification and claims and as accepted by the man skilled in the art. is intended todefine a length of strip made up 0! two or more pieces J'oined together end to end, and ordinarily is not intended to define an endless band of strip.

While in accordance with the patent statutes several forms of the invention and several .ways 01 practicing the method characterizing the invention have been illustrated and described, it should be understood that the invention is not limited thereto or thereby but is defined in the appended claims.

We claim:

1. That method of making rolled metal strip which comprises aligning the ends of two strips with each other, clamping the strip ends in the aligned position, cutting off the crop ends of the strips so that the ends 01' the remaining main portions of the strips are in relation ior'welding, welding the ends of the strips together while still clamped to form a, continuous strip, and unclamping the strip.

2. That method of making metal strip which comprises aligning the ends of two strips with each other, clamping the strip ends in the aligned position, cutting oil the crop ends 01 the strips with the same cut on each strip end and so that the ends of the remaining main portions 0! the strips are in relation and have identically cut edges for welding, adjusting the clearance between the ends or the strip, butt-welding the ends of the strips together while still clamped to form a continuous strip, and unclamping the strip.

3. That method oi making metal strip which comprises aligning the ends of two strips with each other, clamping the strip ends in the aligned position, cutting of! the crop ends of the strips with the same cut on each strip end, welding the ends of the strips together without unclamping to form a continuous strip, and unclamping the strip.

4. The process of making continuous metal strip whichcomprises aligning a strip end with a shear with the crop end of the strip extending through the shear, clamping the strip in the aligned position, shearing oil the crop end of the strip, holding theremaining'portion oi the strip out of position but still clamped, aligning a second strip with the other side of the shear with the crop end extending through the shear, clamping the second strip, shearing the crop end of the second strip, adjusting the distance between the clamped ends of the strips, moving the strips while in clamped position relative to the shear to positlon the ends for welding, welding the strip ends together, unclamping the strips, and coiling the continuous strip.

5. The process of making continuous metal strip which comprises aligning a strip end with a shear with the crop end of the strip extending through the shear, clamping the strip in the aligned position, shearing oil! the crop end of the strip, aligning a second strip with the other side of the shear with the crop end extending through the shear, clamping the second strip,

shearing the crop end of the second strip, adjusting the distance between the clamped ends of the strips, eflecting relative movement between the strips while in clamped position and the shear, and welding the strip ends together.

6. The process of making continuous metal strip which comprises clamping a length of strip, shearing of! the crop end or the strip, aligning a second strip with the first, clamping the second strip, shearing the crop end of the second strip, efiecting. relative movement between the strips while clamped and welding means to position them for the welding operation, welding the strip ends together, and unclamping the strips.

7. The process of making continuous metal strip which comprises aligning a strip endwithanother strip end, clamping the strips in the aligned position, shearing oflf the crop ends of the strips, effecting relative movement between the sheared ends of the strips while clamped and welding means, welding the clamped strips end to end, and then unclamping the strips.

8. The process 01' making continuous metal strip which comprises aligning a strip end with a shear with the crop end of the strip extending through the shear, clamping the strip in the I aligned position, shearing oil! the crop end of the 9. Apparatus for welding metal strip portions" end to end comprising means engaging with,the sides of the strip portions for aligning the strip portions with each other, means for clamping the strip portions in aligned positions, means for shearing the crop end of each strip portion so that the cuts thereon are identical, means for ad- Justing the clearance between sheared strip ends, and means for welding the strip ends together without releasing the clamping means.

10. Apparatus for welding metal strip portions end to end comprising means for aligning the strip portions with each other, means for clamping the strip portions in aligned positions, means for shearing the crop end of each strip portion, and means for welding the strip ends together without releasing the clamping means.

11. Apparatus for making continuous strip comprising a shear, means for aligning a strip end with the shear with the crop end extending therethrough, means for clamping the strip in aligned position, means for aligning a second strip with the other side of the shear with the crop end extending therethrough, means for clamping the second strip in aligned position, a welding unit, means for moving the clamping means relative to: the shear and welding unit to position the clamped, aligned and sheared ends for welding, means for moving the clamping means toward and from each other to adjust the clearance between the strip ends, and means for coiling the strip after welding.

12. Apparatus, for making continuous st comprising a shear, means for aligning a strip end with the shear with the crop end extending extending therethrough, means for clamping the second strip in aligned position, a welding unit,

means for effecting relative movement between the clamping means and the shear and welding unit to position the clamped, aligned and sheared ends for welding, and means for moving the clamping means toward and from each other to 5 adjust the clearance between the strip ends.

13. Apparatus for making continuous strip comprising a shear, means for aligning a strip end and the shear with the strip crop end extending therethrough, means for clamping the strip in aligned position, means for aligning a second strip and the other side of the shear with the strip crop end extending therethrough, means for clamping the second strip in aligned position, a welding unit, and means for effecting relative movement between the clamping means and the shear and welding unit to position the clamped, aligned and sheared ends for welding.

14. Apparatus for making continuous strip comprising a shear, means for aligning a strip end with the shear with the crop end extending therethrough, means for clamping the strip in aligned position means for aligning a second strip with the other side of the shear with the crop end extending therethrough, means for clamping the second strip in aligned position, a welding unit, and means for moving the clamping means laterally relative to the shear and welding unit to position the clamped, aligned and sheared ends for welding.

15. Apparatus for making continuous strip comprising a shear, means for aligning a strip end with the shear with the crop end, extending therethrough, means for clamping the strip in aligned position, means for aligning a second strip with the other side of the shear with the crop end extending therethrough, means for clamping the second strip in aligned position, a welding unit, and means for moving the clamping means longitudinally relative to the shear and welding 40 unit to position the clamped, aligned and sheared ends for welding.

16. In apparatus for joining metal strip end to end, the combination of a coil box for receiving the strip, a roll-pass for flattening the strip as it 45 passes from the coil box, a shear for cutting on the crop end of the strip, aligning rollers rotatable about vertical axes positioned between the shear and the roll-pass and adjustable to engage with the sides or the strip to align it with the 50 shear, a vertically reciprocable clamp for releasably holding the strip in aligned position during the crop-shearing operation, a strip-coiling reel positioned in alignment with the other side of the shear, a roll stand positioned between the 55 reel and the shear, aligning rollers rotatable about vertical axes associated with the roll stand and adjustable to engage with the sides of a second strip carried by the reel to align the strip with the shear, a vertically reciprocable clamp for releasably holding the second strip in aligned position during the tail-end crop-shearing operation, and a welder adapted to weld together the abutting ends of the aligned strips, said welder and shear being relatively movable as a unit with re- 65 spect to the clamped strips whereby the strips may be welded after shearing without unclamping.

17. In apparatus for joining metal strip end to end, the combination of a coil box for receiving the strip, a roll-pass for flattening the strip as received from the coil box, a shear for cutting off the crop end of the strip, a vertically reciprocable clamp for releasably holding the strip in aligned position during the crop-shearing operation, a strip-coiling reel positioned in alignment with the other side of the shear, a roll stand positioned between the reel and the shear, a. vertically reciprocable clamp for releasably holding a second strip carried by the reel in aligned position during its crop-shearing operation, and a welder adapted to weld together 'the abutting ends of the aligned strip.

18. Apparatus for making continuous strip comprising a shear, means for aligning a strip end with the shear with the crop end extending therethrough, means for clamping the strip in aligned position, means for aligning a second strip with the other side of the shear with the crop end extending therethrough, means for clamping the second strip in aligned position, a welding unit aligned laterally with the shear, and means for moving the shear and welding unit laterally to move the shear voil of and the welding unit over the clamped, aligned and sheared ends of the strip whereby the welding operation can be performed without unclamping the strips.

19. Apparatus for making continuous strip comprising a shear, means for aligning a strip end with the shear with the drop end extending therethrough, means for clamping the strip in aligned position, means for aligning a second strip with the other side of the shear with the crop end extending therethrough, means for clamping the second strip in aligned position, a welding unit aligned longitudinally with the shear. means securing the clamping means together, and means for moving the clamping means longitudinally while still clamped on the strip to carry the sheared, aligned'and abutting ends of the strips from the shear to the welding unit without unclamping whereby the welding operation is facilitated.

20. Apparatus for welding metal strip end to end and comprising means for holding the strip ends in relation for shearing, means for shearing the strip ends so that the ends of the remaining main portions of the strips are in relation for butt welding, and means for moving the shearing and welding means so as to position them in turn over the adjacent edges of the strip to be welded and in operative relation therewith.

21. That method of welding metal stripend to end which comprises aligning the strips with each other, holding the aligned strips, shearing the strip ends so that the ends of the remaining portions of the stripare in relation for butt welding, welding the strip ends together while held in the same position as sheared and without movement of the strip, and then for the first time releasing the strips.

FLORENCE C. IBIGGERT, JR. CHARLES F. BU'ENTE.

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